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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304b038317d7424febed7a79569e284ab18271b803b264e42d946fd8137c54ab' 
  AND token = 'uEeuEr7TttNtEXay1LIkgfJNL3+fybNQl2Sj6uaXv+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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