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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7e36b498c1456b78ad79048a56f4c3c36993a897e14e7d2441b92a4f0f7de7' 
  AND token = '6yavOmFuHMCnMOXlmSDIEn+wLbxJAyLSkDfKvRdhDkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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