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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da72de72df1a61824c3800d834413d6ff3358611d2c99a63d477d08c632f9c87' 
  AND token = 'DkGkL5XNvCl++7t9GPeMXOhvdxI6OX/W/x8nnSrD7Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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