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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460ac09c65a9954425f095b44a83b232ebe6d0c7db5437ea792768388ccd45ed' 
  AND token = 'MeeG33fW9Cp5tMUCN46BLnWCwdw0siCuXOcm3mBplA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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