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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578f88c423564330fdb886b9ef55e4b275b96ac75f37547b14024eaf376ac936' 
  AND token = 'tYj6hQmA5O3KgvY6v1/V0nckb6ebNafiv8sKM42v3EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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