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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d4be7f9c4c492aaa03abc0336c13ea015f5fbf615cd140bbb5f54dcf26cf13' 
  AND token = 'rS45kwk5Dg7FtEKVs0klGn8lYAU9dVviWrGnH7aNG74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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