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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5667c34cc1a429947269670f93ee9e937623431cfcff00a42fa81cbe6b627e5d' 
  AND token = 'IZHOo66Wxu0ntqot6YPqP7vMY55qR4nj6ewlwmR4oXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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