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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d496a48e1daaefc1944dc6e2e61ad30515b28f5ac648c7c37490a8ad0c0025' 
  AND token = '57bQ/bt5tftjfA6tSrfI4Waezux5zaqleLmlCYqcwD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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