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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7174ff471a88340d7e8cdc6ac38eb3a5f5e888fe7861a96ee5d632196c262e7e' 
  AND token = 'pajZLxFNouskwabB42idjZ/qQlxFRrqhBlgk6/MxZ0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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