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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4959fea02abbacdf749b7599414fdd848ad5dd838efe230d224817c43c1f23b7' 
  AND token = '2yJxVcUiZr2OUZFVzbjhdQQ6YFTlHFP2VXHxVodl2Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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