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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e93fb1ad4c2ec5efe91b472ea80e7be4dbd3ff63aaad88d5a830cfd96aa2a5b' 
  AND token = '5mcEIt1N53Ctc4oJW+XGVXqRYzVCePQKaHOce4M2w2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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