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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2ee4149a85fe6450f65204940d7d677bf2bc2233c66eab2c3aabf317a20cc5' 
  AND token = '3tgIlrjbDdNRCLhOGmSgUg4qGQSv0HEPhUQaVzNqlxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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