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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2393fe20a6d07519d62a55fd1627a62687d01d0f08cab86de75a18752d93da4' 
  AND token = '7r3WEhKaWydtRptRxVv5XKBHnA+YnVoVjh4wsqT52vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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