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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ce14fcb964e060fc1fe45df752817b3dfef1c457020f91767482c6ff1d59ff' 
  AND token = 'RtcS8EuY4w7Z5pD6AVw5hEhxnpsZ4V4XdiF4ynReeDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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