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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fa23560bd7c14848b497eefc84067707b4cd9d9be2f41346c064f06d921d65' 
  AND token = 'kMGPszKA5EG9EFkw8+8/GQ0Csv9e5/Li3pANyW9Py2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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