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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204496de5e86cb4f8f58ddf747c5556cf8956c79d4b487b6f408e38226fa9908' 
  AND token = 'Gs/KDKbSz4dR3ci1EziCF4CCRUriVOXdUXYrfN9COns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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