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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afe040f53c344186107df0fa04154452a7f280078891a26e421c9db9f370658' 
  AND token = 'ubAfNexPGyc5Q9WuaUxJ1PXHGmLqJsS0jk4WFKQqUbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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