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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af412e4bfcd728e813f0206b6110efe7f62575683f63500fd1edd25b1796103' 
  AND token = 'agPpTYGQx695S+OjC6GcKyjZBnTR9nr1XrrsP/BzNdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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