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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca0f9ceff0fd79d807615f44403aacd83ea5ddc52836c517c7a26a820a1bbd8' 
  AND token = 'qqES4pzeivLzp9CsZA8jRKPYv6eDfYdtEWxUFd3lhuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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