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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98c2ab5c59cb997b4a65631e9cb9d31cbe8c442d8db373b5301169fb3c93a74' 
  AND token = 'm7ddNV/tFL8cq61NfEHVjTX8SjKy0f9oYCWWWffSias=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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