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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0165d6c5cbae7827899ca15415d4bead1ac6662d7fb76dedfb7d93846b4f0fd2' 
  AND token = 'rJJitA1lVZa+SrNGspLBGR7EHNbYzkuXQHAXzQp6zSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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