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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fc588ea712517f6c5581440e437fa065f6b0930774165e600d17650892c3c8' 
  AND token = '+R/Mwq7QcbVK0GwfgNSX9/eaKueryVOViduM6eCJtNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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