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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3faade16bb94200156f5b230a7d1de9147e1c6e0b4124c7f5c1336aed91b234' 
  AND token = 'Tap5nkgmj1RBS+lA7wqRIFtwBglGQcw9ax0CJh4N91g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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