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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c632e484612a509982733082c887f73043344925b1f6e0bb3fdf9b094767799' 
  AND token = 'tOBB8pOZ8V8KDW4mC3D6OkUqdmjeZWl6Ss9M1qFIg/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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