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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91db48e55c9edff711424e3f29a4fdcbbba9a8dfc06c4bb2cde46264291cfc1' 
  AND token = '846huMVjc38nzbY28ldP+EhycB7Xq04c6TPKTd1NoGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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