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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e76017822dcb92aa415d5a16791bde8f8d2346ad3776eea49b945804367eba7' 
  AND token = '7srH1vomiZZXwX+zEnP9abYXBtDF138KukLenFfpzEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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