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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7ef4f4e6cea66f8f43841ecd4d1fe6092d3add181121feeea82f2d825f997f' 
  AND token = 'NCqncbyfCld5VAGwgrq56rToB+SBGGy/aWILuZ+Tw9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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