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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a3f824a17505eaf78048c91bb363190dfa9541616e2667513e45a370a4ab5d' 
  AND token = '42dZiSqV4vGuofnZSMBH8+6V6IThy90MliPuNLQn2hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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