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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508e07c0b30e9bd1b0eec7d1b932567c3bd85aaa8a3e21f8954fc0f2409fe7f6' 
  AND token = 'kqqSd5R1lIHmvZW9YZmMuZTgoWUhed6WRhlEvTCtT4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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