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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1e330259f3eae3dcac8d0c89827c7f09b2bb34ae356b3dca84cb16d577b9e8' 
  AND token = 'F376ApNXkWUo1JMbj6Q4PJegReh1aQztLEqF13Y9pAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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