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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99ec7b94fcabb227fe2092395f3bbb90248ae4887e708dffb171088142c533c' 
  AND token = 'Y4TTUs94qi/wHCsPTShdHsg1NxKh9+UU0G9mj0QFgus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}