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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd625ff9d23c017d34c3d173d4e0dba9151680a73789f85020e94486085272e4' 
  AND token = 'tJGFtzYiAJUeWgMA1GAScNkLGBmCHCl4kB5xqES/9Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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