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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ddf237f95782d6491be3143874638644fb2d5f8a8fb50295d9033f7843d600' 
  AND token = 'aJt1b5iT6sdhLunnUw/07IjymcsPbaJTfGF+mn8muIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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