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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dac4c8b1dba4b696f31b88a878db9c4a6e94bf78b9d4ec39ac539159a123e2e' 
  AND token = 'B2A2YDatFhFl9ZRzJMzjzEBgW79f1jsiMpFPewsiu1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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