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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd567e5d849df8b6d09c269cce0ef828428c356532f8646aa9223b827a40213ba' 
  AND token = 'fWhcX1Q2Ro6RbNpTtUGKPQ/nBCcRL68LycTRS6Ql8Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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