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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148d59433b564803ef30044fcda40f26ffe888eab09430d52b88d36369056d87' 
  AND token = 'LRtxW2DNzw7xs+EFc2+F3Co2L7QkwJrMdodzn+zraM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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