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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4036d0c85dc199b4053a949dbeb571f6fce68fe4882cdb723c7b758f2555dd05' 
  AND token = 'inM6KmJskshJc54BXitkgI58gIU1MtYMQ+jGmHA038k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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