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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abd330a580c346e39df11992b3cc482b9fcbe06ff3f116c17fc4c8d1121bd69' 
  AND token = 'OChrugfW+5xwEmoU/UrDdihzRuZzABuM2bp5mP7bnNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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