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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426964d681ee8881bf21de590c86db9bf047168e2ea84cb264c925599ce77609' 
  AND token = '2TgzcPb1wa985TnKF5MivpyUqyWxGnfZ89ODVL/Dysw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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