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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84c0bd33c954152fa1887c98684cb4f7b752645c5b5ba6d2c0feda443d15fc1' 
  AND token = 'KMDir5Cv2kZvmEie1cmH4u/Y/Q9Em9OzG0FeYBmYTCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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