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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63af28175bb197108557f2e4934ca71965a885176d4bb9507cd68b8fbec4101d' 
  AND token = 'rrUBZrYijMhIKY3AGAt+BOYuj475b5mPkDJPNO7g7SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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