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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f42c482277bab191cba4ed3f1466168d76d8dcbeb6fd4fa56821e1d7c199b9' 
  AND token = '5ikOuwyQPW6Mn033wTGhr4y2GCb/xG5gCGbFhsk4ycE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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