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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa929a6a2cab86a369d4577e00cf64f8b2df9a4b4a8509d32a4503632b5660b7' 
  AND token = 'rAA8awXDIsNnKwOrZi5v/aj3cocg/KEzu5fm4IMo7ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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