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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6500d635f911385c19950151bb12c140e58d269ba590dd39c25ca76fe076fc91' 
  AND token = 'EYBExqSkXrb15SdZCeyFZY6cOGzLIxIBZguFiP69IAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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