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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6eb91e5eefea0ad25e4e02ad53fa5e6fa58ec25a23a5fd78ed0124d275ac785' 
  AND token = 'bVouoZReF6QUvY4JcVuoKtEuj1Jx4efFkk0WxrEkz8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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