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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f1f6f26f5f37f5e1677c426caf4712355df3b731b373a82fa09603236f865a' 
  AND token = 'K1cDXjMtXcACEE2v9Huj9gec6doCko2lMDlowdcfB38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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