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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6decb5186a08940cc9c9769f50a893d0dbc4cbaa6a692871a6c80cdc76f3f6d9' 
  AND token = 'jpNz3vTq2+hmnGfEd+1chO10YprAoCyEXuN7qwrFhco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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