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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285c8e4447180202912016ccc82c420f97de4dc07172447b4a5945730d4b5f8d' 
  AND token = 'aC8NWWpxaBrvSJNSGAFwPhFkOvQogD8X/loGngrWUxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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