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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32c42d1a8c274f1fc3d5a6fead32c57618c509ddcb7b01a4671eef8ab720b7f' 
  AND token = 'MOldE7f8yhrCLNhSwzkK93u8Bqv5bOLeID7qEVK456Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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