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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49d84a2159fa96b8ecdd0c427744c35a002f2e92577471aff6f49a3b5a5eb42' 
  AND token = '/VUbeN58JzI9xIFMinpH6mR+GspJNYeY0ebKG240xgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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