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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d719262981fae9405320a4a85295b46f0f102f890b40297618cbafd26af0ca' 
  AND token = '1ZJnI8RNXBlIHXg1v4dLgqGzj9WarnQCt/tcxjZaD1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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