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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f2cb72252a631b10142e00b30d5bf61dbdb29e65b7c489fc1375419bc47c2e' 
  AND token = '886ZCRzTkYLXFHo10wGEuo3S1qNKJEE6gtjAmkDJhbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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