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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656bff0e0c8cd5768d065b56d2a2b016fc535706892a0cf7e0edc3f7d5151f62' 
  AND token = '93NONHWy2Q3NZhCRNuBLEUOdx8nGawmM9pMHY9cndwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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