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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac299cf428c1e84e1b7ffa5890307faff112e409b05be3663cb7714c1990e298' 
  AND token = 'WnYqv6X6HfGw3HIvQiXvTVHL/1gUjV7n5ydfdlnYd8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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