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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c657df716b8ff2f9b0b1bc95d9aae64811237e399e001266ea1e2683c32813' 
  AND token = '125pD3HA3AWk3RWCfplBKtWZBCmv3tPuG5k3BO+lbEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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