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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1362a8a25f5a46a9d4672dc4773513f13c597ab71d72bf7e2ebc49835902a9e' 
  AND token = '0WKJkNglPqgpIj703vA7QgHlnx+xpQ76lJO90g6LJOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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