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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a5c6df908dee16ba4f472b1e1b04860f774d79cf67b581c73a1efe920731f3' 
  AND token = 'VTZ0QzkNVmLp6xJFbnBfaauGaDnFpfhUl6Hvl6JiIOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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