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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1265ae25ac7ea99a60a87a12548402c2fccf8bac0386b5f081ae12578b8cba' 
  AND token = 'edc2sBCvmuxvPs0e9Q2FCD9qKumqUy/nqubcAnml41M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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