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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73af15dbc529c6336fcade853a773dd605b537c9e60667c915260959003fffdc' 
  AND token = 'yaxpoZ25NWSTF9H8efYgfF/6kgg/3zS45BR0CmAOhss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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