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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da8afe33e1fd136f31049c451ec1460fa100710b27fbab45d15b8768b7b6b25' 
  AND token = '2KvHFC13fvvnreQEMILVz5ArkCoJzYTv0RFgKmD9F68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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