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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5633bff1e1ad8868c7527dc051ea2d1594c0217b9497712529cc93c062655d13' 
  AND token = '1wQjkRPuxqOeldss9XWioEu17qiJQr/er5LZzb14jAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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