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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a01557721c0665e5fa76e177f1a8d8d0ca9ad48ff67cc236821a1320146687c' 
  AND token = '0Phwuh09aPvr/KjHZzL1WuO+Daxpp4t9JpR6kv0vnGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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