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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95482d63b6e477be4e80ef6f807640335475658e2ab9909faa1ddb1cbb7c8a7' 
  AND token = 'o6szMZi6BfM20dnqZNV8vRjnNjEnyx+R7nMBWxSEwe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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