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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a1ca8e083f7543825eebd62df7175a19d4164352e8d721e5a3ff7eeae9264d' 
  AND token = '0uOsMS8IwGGbewFeBQ+kHgkrl8/IS01QSL/7/vzK3gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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