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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db81880891d041aa0bf02dc6e112537ae32055f68bb2e541ea6fb8b783675e7' 
  AND token = 'F+JbzlU0H8fYkEwNHYOLyghBPs8MjKmMDWHhMJdPW2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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