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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2bf1ee45766ae0ba67faf35bacdd63076bb391b4994a47f37b392fa180a563' 
  AND token = 'V4wIQSj2dBWaNGs0XSae81OpOk0/oHQjoNE05K+TR5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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