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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea9a76f077646620e0aebd552ff5e519fb82c5c063dbf0e7b87ccbede359467' 
  AND token = 'Y5w5THL8JaM3gR1Z4lrKQulMomu+EQWfHSfbTw5Sykg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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