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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36969f2e8decb70e58699fae76280ee6aa2966026fe193cec8cc50751ec2b9f9' 
  AND token = 'WIyy3puZMft61VcJVkNVVkoFHD0PoPiDvHe2PM953cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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