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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0f96be9c1cd63f9b2f19adf482c0cecfd8c9d9dce551fc1af4b29898f24d46' 
  AND token = '8bfS4F8RcGDuvVq/oaoXtAvyCuBCCYGVwOYy/O+bqjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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