SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971d37d3a23b657f7a8beb3a57c07f70a3471c9b5a96e083a875edbcf389e20d' 
  AND token = '/KWliNHCDZYGXNLwsEDFW4aP9dbWB+tYZzhT3/VQYEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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