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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8003628ad0388bed1adaec49ec8d7ac4870d25bb81376514743dcf6655a44e' 
  AND token = 'tgX4HjntQ0CVQT76vuhDkQ+c/l+82EiUAOO1r2V8iHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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