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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbaddd45522dbec92d1813cc57a274bc388de4597004b412d52f3bfb7244c09' 
  AND token = 'WA9ryNY37Z5pX+vAPbyAK+LweNfJftn5NTD/ul2styI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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