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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c80b9e0abb61270500531a9e36e03a80ff8125fbc43a51bc1bbeca90941f763' 
  AND token = 'c/TPpLQnzpidDaNOso8hx4Cjtp0DIsExt50UMnTSn3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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