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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd12c255eb62b44f8d2a19804eff4b677bcd54dd19eaa26a434c5ba0e19b307b' 
  AND token = 'xgFnZv+bwrLOCNqKPgAoY9mEwoy0szcwad6i57KoyYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00150

JSON explain

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