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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8162824296df41b6363862f08b55625e200d6a8e93748885a18c026651c0c84' 
  AND token = 'FM3j4rwm47pdy176JfqCvB04qZ6hAeJNiDvoyP0KNS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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