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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bcd32261369be49fddbae2a5117561165888e9d63b55ef7f313c9b65353efe' 
  AND token = '8mPv8y8hx2JOHtlyAWrPKcUC1I4bHiNxefqRMc3PMj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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