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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b737dd1937b4e25970139a70b8b019a9d4332a3aa0c4258248e1a273b92f24a' 
  AND token = 'hu5DZWSzw+J5jDJ45BPcrsURrHLSxHJRtDZpCVVdRfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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