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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082913131e8518822832721d685399123c0f16b6c68e1503f87d8ada60ba3c22' 
  AND token = '8ftp3MWFtFUMf/cokpQ/mMqApL0OFZi5PLMHpGu165w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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