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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ab858c2292d9c0696832c33587993bb5ed39bcb79ea9dd536b893aa356f4b5' 
  AND token = '5MvW8dJkrhaM706I4pyIAvZuZ40DX4wxOp5I76KGmsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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