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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb85f144460288dd830a2b2bdab8fcd8250e48275bb53bf366410f474e3dfc0' 
  AND token = 'd2B+znakfDQ2l6665XEcjZ+U6Z3WdO4ePrdjNbOoBg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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