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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be86bb2a9faaee0eb35ec0a1d760a09541a0c1f5fcd8bd30ca09fe226d5224c' 
  AND token = '3GQBr61ikzB/OA3zg35o8MSoTKK6j4ZiDF9+SWNmFJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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