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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4f2eba8c2c2575eb51cf82d16a911a6cdc26d858867fab7b9c7fd5ab8c218d' 
  AND token = '/JNN88Ha03omWpzPENaL0Km/hJk+zWk3ZYJFqD8QccA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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