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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8704daa0c4728042ac71c2726044adb68d6b8b682a8910a1cd62cdf1e0c9cefe' 
  AND token = '0kUGz16NR4/lklCMt1pHl5eiRpY2iraXe7wrkiQX8yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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