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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d2fd7d0a67c1e99fb33b7fbd17ffd65e81465cc9f35a9d4ac22ecad3d0c1df' 
  AND token = 'kTAfS+GVBb7QkTBmaHVCSX8ysaZ/ROBqzEz9xABvZmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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